The 33-year-old fighter has signed an exclusive deal with the organization and will compete in Bellator’s season-four lightweight tournament, officials today announced.

The eight-man tourney kicks off in early 2011 and will determine a future title challenger.

McCullough, a nine-year pro from Huntington Beach, Calif., posted an 8-4 record with the WEC, which included a 13-month run as the organization’s lightweight champ from 2007-2008.

“‘Razor’ Rob is a dangerous lightweight with championship experience who has consistently displayed an ability to end fights throughout his career,” Bellator Chairman and CEO Bjorn Rebney stated. “If you are a fan of the lightweight division in MMA, you’ve got to be a fan of Razor’s.”

Recently, the former kickboxer has competed for the popular Tachi Palace Fights organization, and with wins over Isaac DeJesus and UFC vet Corey Hill, now has won three of his past four fights.

Over the past 18 months, McCullough has decided to lead a sober life, got married and had a child.

“Before I was fighting just because I loved to do it and I couldn’t believe I was getting paid to do what I love, but now it’s a lot more serious,” McCullough stated. “The guy that I’m fighting is trying to take food off my kid’s table. It’s entirely different now. I’ve found a new focus and a new motivation, so I’m ready to get in there and get buck wild in Bellator.”

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